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's-Gravenhage, Dr. W. Junk, 1968. Two parts in two. 8vo (25.0 x 16.4 cm). 681 pp. Original uniform printed wrappers. = A very uncommon contribution to the knowledge of extinct Palaeozoic reef-building sponges. However, for a long time they were regarded as corals, hence the word Hydrozoa in the title. Rarely seen complete. Includes a large bibliography, a list of additions and corrections, and an index. A very good - as new - clean set.…